Dear IROWG, we have already received 80+ abstracts for OPAC-IROWG 2026 - thank you very much for your interest in the conference! We are looking forward to very interesting presentations and discussions. https://opacirowg2026.uni-graz.at/en/ Since we have also received some (not totally unexpected) requests, we have extended the abstract submission deadline by *one week*. Please note that *May 10* is the *final* deadline. https://opacirowg2026.uni-graz.at/en/abstract-submission/ We start sending out the abstract acceptance e-mails today, but it is already clear that all abstracts submitted so far will be accepted. Therefore, please proceed with*booking your rooms* since the block reservation at Seggau Castle is only secured until *May 31 - *and it seems that we will be using up all the rooms that we could reserve. * *Please go to: https://booking.seggau.com:800/Hotel-Schloss-Seggau/inquiry.aspx Change language("Sprache") to English, if needed. Select the dates Enter the promotion code: OPAC2026 Click on "Show available rooms" - and select. You will notice that we have negotiated very reasonable room rates - which include breakfast. We are looking forward to seeing you in Austria in September! (and may the force be with you). Uli Foelsche, on behalf of the organizing committee. U. Foelsche, J. Danzer, M. Schwärz, (WEGC & IPhys UniGraz, AT), OPAC Chairs H. Shao (JCSDA and UCAR, transitioning to Naval Research Lab., USA), IROWG Co-Chair A.J. Mannucci (JPL, Pasadena, USA), IROWG-CGMS Rapporteur ===================================================================== ************************************************************************** - Ulrich Foelsche - University of Graz - Institute of Physics, Department of Astrophysics and Geophysics (AGP) - Universitaetsplatz 5, 8010 Graz, Austria - Wegener Center for Climate and Global Change (WEGC) - Brandhofgasse 5, 8010 Graz, Austria - Tel: +43-316-380-8590 - E-mail: ulrich.foelsche@uni-graz.at **************************************************************************